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+.Dd $Mdocdate: November 4 2016 $
+.Dt D2I_X509_SIG 3
+.Os
+.Sh NAME
+.Nm d2i_X509_SIG ,
+.Nm i2d_X509_SIG
+.Nd DigestInfo functions
+.Sh SYNOPSIS
+.In openssl/x509.h
+.Ft X509_SIG *
+.Fo d2i_X509_SIG
+.Fa "X509_SIG **a"
+.Fa "unsigned char **pp"
+.Fa "long length"
+.Fc
+.Ft int
+.Fo i2d_X509_SIG
+.Fa "X509_SIG *a"
+.Fa "unsigned char **pp"
+.Fc
+.Sh DESCRIPTION
+These functions decode and encode an
+.Vt X509_SIG
+structure which is equivalent to the
+.Sy DigestInfo
+structure defined in PKCS#1 and PKCS#7.
+.Pp
+Otherwise these behave in a way similar to
+.Xr d2i_X509 3
+and
+.Xr i2d_X509 3 .
+.Sh SEE ALSO
+.Xr d2i_X509 3